MX31: Add support for NAND to QONG board

The NAND device is connected to the FPGA of the QONG board
and not to the NFC controller. For this reason, the FPGA must
be set and initialized before accessing to the NAND itself.

Signed-off-by: Stefano Babic <sbabic@denx.de>

board/davedenx/qong/qong.c

@@ -25,6 +25,7 @@
 #include <netdev.h>
 #include <asm/arch/mx31.h>
 #include <asm/arch/mx31-regs.h>
+#include <nand.h>
 #include "qong_fpga.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -38,6 +39,15 @@ int dram_init (void)
 	return 0;
 }
 
+static void qong_fpga_reset(void)
+{
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
+	udelay(30);
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 1);
+
+	udelay(300);
+}
+
 int board_init (void)
 {
 	/* Chip selects */
@@ -101,6 +111,15 @@ int board_init (void)
 	mx31_gpio_mux(IOMUX_MODE(0x91, MUX_CTL_OUT_FUNC | MUX_CTL_IN_GPIO));
 	mx31_gpio_mux(IOMUX_MODE(0x92, MUX_CTL_GPIO));
 	mx31_gpio_mux(IOMUX_MODE(0x93, MUX_CTL_GPIO));
+
+	/* FPGA reset  Pin */
+	/* rstn = 0 */
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
+	mx31_gpio_direction(QONG_FPGA_RST_PIN, MX31_GPIO_DIRECTION_OUT);
+
+	/* set interrupt pin as input */
+	mx31_gpio_direction(QONG_FPGA_IRQ_PIN, MX31_GPIO_DIRECTION_IN);
+
 #endif
 
 	/* setup pins for UART1 */
@@ -127,32 +146,11 @@ int misc_init_r (void)
 #ifdef CONFIG_QONG_FPGA
 	u32 tmp;
 
-	/* FPGA reset */
-	/* rstn = 0 */
-	tmp = __REG(GPIO2_BASE + GPIO_DR);
-	tmp &= (~(1 << QONG_FPGA_RST_PIN));
-	__REG(GPIO2_BASE + GPIO_DR) = tmp;
-	/* set the GPIO as output */
-	tmp = __REG(GPIO2_BASE + GPIO_GDIR);
-	tmp |= (1 << QONG_FPGA_RST_PIN);
-	__REG(GPIO2_BASE + GPIO_GDIR) = tmp;
-	/* wait */
-	udelay(30);
-	/* rstn = 1 */
-	tmp = __REG(GPIO2_BASE + GPIO_DR);
-	tmp |= (1 << QONG_FPGA_RST_PIN);
-	__REG(GPIO2_BASE + GPIO_DR) = tmp;
-	/* set interrupt pin as input */
-	__REG(GPIO2_BASE + GPIO_GDIR) = tmp | (1 << QONG_FPGA_IRQ_PIN);
-	/* wait while the FPGA starts */
-	udelay(300);
-
 	tmp = *(volatile u32*)QONG_FPGA_CTRL_VERSION;
 	printf("FPGA:  ");
 	printf("version register = %u.%u.%u\n",
 		(tmp & 0xF000) >> 12, (tmp & 0x0F00) >> 8, tmp & 0x00FF);
 #endif
-
 	return 0;
 }
 
@@ -164,3 +162,56 @@ int board_eth_init(bd_t *bis)
 	return 0;
 #endif
 }
+
+#if defined(CONFIG_QONG_FPGA) && defined(CONFIG_NAND_PLAT)
+static void board_nand_setup(void)
+{
+
+	/* CS3: NAND 8-bit */
+	__REG(CSCR_U(3)) = 0x00004f00;
+	__REG(CSCR_L(3)) = 0x20013b31;
+	__REG(CSCR_A(3)) = 0x00020800;
+	__REG(IOMUXC_GPR) |= 1 << 13;
+
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_WP, MUX_CTL_IN_GPIO));
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_CE, MUX_CTL_IN_GPIO));
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_RB, MUX_CTL_IN_GPIO));
+
+	/* Make sure to reset the fpga else you cannot access NAND */
+	qong_fpga_reset();
+
+	/* Enable NAND flash */
+	mx31_gpio_set(15, 1);
+	mx31_gpio_set(14, 1);
+	mx31_gpio_direction(15, MX31_GPIO_DIRECTION_OUT);
+	mx31_gpio_direction(16, MX31_GPIO_DIRECTION_IN);
+	mx31_gpio_direction(14, MX31_GPIO_DIRECTION_IN);
+	mx31_gpio_set(15, 0);
+
+}
+
+int qong_nand_rdy(void *chip)
+{
+	udelay(1);
+	return mx31_gpio_get(16);
+}
+
+void qong_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+	if (chip >= 0)
+		mx31_gpio_set(15, 0);
+	else
+		mx31_gpio_set(15, 1);
+
+}
+
+void qong_nand_plat_init(void *chip)
+{
+	struct nand_chip *nand = (struct nand_chip *)chip;
+	nand->chip_delay = 20;
+	nand->select_chip = qong_nand_select_chip;
+	nand->options &= ~NAND_BUSWIDTH_16;
+	board_nand_setup();
+}
+
+#endif

board/davedenx/qong/qong_fpga.h

@@ -33,8 +33,8 @@
 #define	QONG_FPGA_TMS_PIN		25
 #define	QONG_FPGA_TDI_PIN		8
 #define	QONG_FPGA_TDO_PIN		7
-#define	QONG_FPGA_RST_PIN		16
+#define	QONG_FPGA_RST_PIN		48
-#define	QONG_FPGA_IRQ_PIN		8
+#define	QONG_FPGA_IRQ_PIN		40
 #endif
 
 #endif /* QONG_FPGA_H */

include/configs/qong.h

@@ -52,6 +52,8 @@
 #define CONFIG_MXC_UART	1
 #define CONFIG_SYS_MX31_UART1	1
 
+#define CONFIG_MX31_GPIO
+
 /* FPGA */
 #define CONFIG_QONG_FPGA	1
 #define CONFIG_FPGA_BASE	(CS1_BASE)
@@ -96,6 +98,7 @@
 #define CONFIG_CMD_NET
 #define CONFIG_CMD_MII
 #define CONFIG_CMD_JFFS2
+#define CONFIG_CMD_NAND
 
 /*
  * You can compile in a MAC address and your custom net settings by using
@@ -188,6 +191,30 @@
 #define PHYS_SDRAM_1		CSD0_BASE
 #define PHYS_SDRAM_1_SIZE	0x10000000	/* 256 MB */
 
+/*
+ * NAND driver
+ */
+
+#ifndef __ASSEMBLY__
+extern void qong_nand_plat_init(void *chip);
+extern int qong_nand_rdy(void *chip);
+#endif
+#define CONFIG_NAND_PLAT
+#define CONFIG_SYS_MAX_NAND_DEVICE     1
+#define CONFIG_SYS_NAND_BASE	CS3_BASE
+#define NAND_PLAT_INIT() qong_nand_plat_init(nand)
+
+#define QONG_NAND_CLE(chip) ((unsigned long)(chip)->IO_ADDR_W | (1 << 24))
+#define QONG_NAND_ALE(chip) ((unsigned long)(chip)->IO_ADDR_W | (1 << 23))
+#define QONG_NAND_WRITE(addr, cmd) \
+	do { \
+		__REG8(addr) = cmd; \
+	} while (0)
+
+#define NAND_PLAT_WRITE_CMD(chip, cmd) QONG_NAND_WRITE(QONG_NAND_CLE(chip), cmd)
+#define NAND_PLAT_WRITE_ADR(chip, cmd) QONG_NAND_WRITE(QONG_NAND_ALE(chip), cmd)
+#define NAND_PLAT_DEV_READY(chip)      (qong_nand_rdy(chip))
+
 /*-----------------------------------------------------------------------
  * FLASH and environment organization
  */